On Fri, 8 Jun 2001 17:52:56 +0100 "Steve Thompson" <g8gsq@qsl.net>
writes:
>
>I've been offered a couple of glass triodes, some shape and size as
3-500s
>etc. The anode has several annular rings rather than the vertical
grooves.
>
>These are EEV manufacture, marked C.1112, date code is 1974. Does anyone
>have any ancient data to see what they are please? They were wired up
for
>some sort of dc/lf switching, so I suspect they might be low mu and not
>intended for rf. They come with nice looking ceramic 5 pin sockets - I'm
>guessing that these are the same as the 3-500 etc. uses. Are the sockets
>themselves worth anything?
>
>Thanks,
>
>Steve
>
Hi Steve,
My 1984 Eimac catalog cross references those to the 4-250A -- a
tetrode.
Those ceramic sockets go for about $10 ea at my local swap meet.
73 & Good day,
Marv WC6W
*
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